Gas cooled spot-weld tip



w mm f 7 F MW N 6, EN 3 VM A 5, m0 2 W w 1li VVA W Filed Aug. 16, 1949 LW CORNWALL GAS COOLED SPOT-WELD TIP Jan. 2, 1951 Patented Jan. 2, 1951UNITED STATES PATENT OFFICE 6 Claims.

My invention relates to a gas cooled spotweld tip, more particularly foruse in conducting carbon dioxide gas or the like, for maintaining arelatively low temperature surrounding the fusion area within materialsbeing spotwelded together, and the objects of my invention are:

vFirst, to provide a spotweld tip of this class having novel gasconducting recess means, which evenly distributes cooling gas in anannular pattern surrounding vrthe welding area of the tip, wherebyspotwelding discoloration of materials lbeing welded together iseffectively reduced;

Second, to provide a gas cooled spotweld tip of this class having anannular groove surrounding the welding surface of the tip, and slightlyspaced therefrom, which evenly distributes an annular pattern ofthe gasaround the tip axially thereof, for effectively cooling the same;

Third, to provide a gas cooled .spotweld tip of this class which is verydurable, -due to the particular annular gas distributing recess therein,which maintains operation of the tip at a relatively low temperature;

Fourth, to provide a Agas cooled spotweld tip of this class which isvery compact and readily replaceable;

Fifth, to provide a gas cooled spotweld tip of this class which may beoperated with considerable economy in the use of carbon dioxide gas forcooling the same, and the work being welded; and

Sixth, to provide a gas cooled spotweld tip of this class which is verysimple and economical of construction, efficient in operation, and whichwill not readily deteriorate or get out of order.

With these and other objects in View, as will appear hereinafter, myinvention consists of certain novel features of combination,construction and arrangement of parts and portions, as will behereinafter described in detail and particularly set forth in theappended claims, reierence being had to the accompanying drawings and tothe characters of reference thereon, forming a part of this application,in which:

Fig. l is a longitudinal sectional View oi my gas cooled spotweld tip,shown in connection with a conventional holder, and communicating with acarbon dioxide gas supply, operated in connection with a conventionalspotwelding machine, and illustrating by dash lines the work beingwelded adjacent said gas cooled spot/weld tip and its opposingcounterpart; and Fig. 2 is an enlarged sectional view, taken from theline 2 2 of Fig. 1.

Similar characters of reference refer to similar parts and portionsthroughout the several views of the drawings.

The conventional Welding machine tip holder, as illustrated by dashlines A, supports the spotweld tip B, illustrated in my former PatentNo. 2,449,463, which has now acquired the status of a conventionalspotweid tip. Secured to the upper end of the tip B is a fitting C, towhich the tube D is connected. This tube D communicated with a solenoidvalve E, connected to the carbon dioxide supply F.

My gas cooled spotweld tip i is secured to the tip B in the conventionalmarmer, and is provided With a straight circular in crosssection weldingnib la, integral with an enlarged diameter portion ib at the transitionof which an annular' recess ic is provided, which surrounds the circularin cross-section welding nib la. Communicating with this recess ic arepassages id, which extend into the hollow bore of the conventional tipB, communicating with the solenoid valve E, which dispenses a certainamount of carbon dioxide gas with each welding operation. It will benoted that the operation of the solenoid valve and the carbon dioxidesupply equipment is no part of my present invention.

It will be noted that the connecting skirt le of the tip I and itsconnected relationship with the tip B is substantially the samestructure as disclosed in my former patent, hereinbefore referred to.

The operation of my gas cooled spotweld tip is substantially as follows:

Each time current is supplied by the conventional spotwelding machinetip holder A to the tip l and its counterpart H, the resistance of thecurrent aiorded by the work G causes consderable heat and fusion of thework G together. With each fusion impulse, carbon dioxide gas is emittedby the solenoid valve, which is conducted into the tip B and through thepassages Id to the annular groove lc surrounding the circular incross-section welding nib la of my gas cooled spotweld tip. The annulargroove lc causes the annular distribution pattern of carbon dioxide gasto pass circumierentially and longitudinally of the welding nib la ofthe tip i, which eiectively lowers the temperature oi the spotweld tip lwith each operation, and tends to cool the work G surrounding the tip l,preventing discoloration of the spots at which fusion occurs within thework. It will be noted that the passages ld delivering gas to theannular groove Ic provide a supply of gas which readily surrounds thenib la, due to the intercommunicative relationship of the annular groovelc with all of the passages ld during issuance of the gas therethrough.

Though I have shown and described a particular construction, combinationand arrangement of parts and portions, I do not wish to be limited tothis particular construction, combination and arrangement, but desire toinclude in the scope of my invention the construction, coinbinatlon andarrangement substantially as set forth in the appended claims.

Having thus described my invention, what I claimas new and desire tosecure by Letters Patent is; y

l. In a gas cooled spotweld tip, a one piece tip member having a hollowportion at its inner end, adapted to receive gas, a circular incrosssection welding nib of solid construction at the opposite end ofsaid tip, a plurality of passages from said hollow portion adjacent tothe outer peripheral side of said welding nib, said tip provided with anannular groove communicating with said passages and surrounding saidwelding nib.

2. In a gas cooled spotweld tip, a one piece tip member having a hollowportion at its inner end, adapted to receive gas, a circular incrosssection weiding nib of solid construction at the opposite end ofsaid tip, a plurality of passages from said hollow portion adjacent tothe outer peripheral side of said welding nib, said tip provided with anannular groove communicating with said passages and surrounding saidwelding nib, said groove open axially of said tip.

3. In a gas cooled spotweld tip, a one piece tip member having a hollowportion at its inner end, adapted to receive gas, a circular incrosssection welding nib of solid construction at the opposite end ofsaid tip, a plurality of passages from said hoilow portion adjacent tothe outer peripheral side of Ysaid welding nib, said tip provided withan annular groove communicating with said passages and surrounding saidwelding nib, said groove open axially of said tip, said tip providedwith an enlarged diameter portion adjacent said welding nib, in whichsaid annular groove is positioned.

4. In a gas cooled spotweld tip, a single piece tip portion comprising awelding nib portion, a hollow holder connection portion, gas portsextending from said hollow holder connection portion into closeproximity to said welding nib, said tip provided with an annular groovetherein communicating with the outer ends of said gas ports surroundingsaid welding nib.

5. In a gas cooled spotweld tip, a single piece tip portion comprising awelding nib portion, a hollow holder connection portion, gas portsextending from said hollow holder connection portion into closeproximity to said welding nib, said tip provided with an annular groovetherein coinmunicating with the outer ends of said gas ports surroundingsaid welding nib, said tip provided with an enlarged portion adjacentsaid nib in which said annular groove is positioned.

6. In a gas cooled spotweld tip, a single piece tip portion comprising awelding nib portion, a hollow holder connection portion, gas ports eX-tending from said hollow holder connection portin into close proximityto said welding nib, said tip provided with an annular groove thereincornmunicating with the outer ends of said gas ports surrounding saidWelding nib, said tip provided with an enlarged portion adjacent saidnib having said annular groove therein, said annular groove open towardthe welding end of said welding nib.

LEO W. CORNWALL.

REFERENCES CITED The following references are of record in the le ofthis patent:

UNITED STATES PATENTS Number Name Date 1,281,454 White Oct. 15, 19182,416,374 Brumberg Feb. 25, 1947

